What is the best platform for a blog?
For a pure blog with growth ambitions, WordPress.com remains the reference: built around writing, categories, and feeds. Squarespace is the prettier choice for a blog attached to a brand, and Wix blogs well enough if the site does more than blogging.
Blogging is where WordPress was born, and it still shows: the writing experience, archives, categories, tags, RSS, and the upgrade path (up to plugins and full ownership on higher tiers or self-hosting later) make WordPress.com the platform a serious blog will not outgrow. If long-form writing is the core of the project and SEO traffic is the goal, this is the default.
The builders treat blogs as a feature rather than the foundation, which is fine when the blog supports something else. Squarespace publishes genuinely beautiful posts and suits the studio, restaurant, or personal brand whose blog is part of the storefront. Wix's blogging has matured and integrates with everything else Wix does; right when the blog sits beside bookings, a shop, or event pages.
Two structural notes for any choice: blogs win or lose on consistency and search intent, so pick the platform you will actually enjoy writing in, and own your audience from day one with an email list signup, because algorithm and SERP weather changes. And if newsletters rather than posts are the real ambition, that is a different product category (beehiiv, Substack) than website builders.